[Xy-pic] xymatrix in index

Chris Heunen heunen at cs.ru.nl
Tue Jan 27 17:10:55 CET 2009

Dear xypic users,

Is it possible to use xypic in an index (of notation)?
For example,
  \index{$\xymatrix{ \ar[r] & }$, arrow}
does not compile. Can the xymatrix be protected, somehow?

Best wishes,
Chris Heunen

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